Abstract

We study theoretically the generation of photon pairs by spontaneous four-wave mixing (SFWM) in photonic crystal optical fiber. We show that it is possible to engineer two-photon states with specific spectral correlation (“entanglement”) properties suitable for quantum information processing applications. We focus on the case exhibiting no spectral correlations in the two-photon component of the state, which we call factorability, and which allows heralding of single-photon pure-state wave packets without the need for spectral post filtering. We show that spontaneous four wave mixing exhibits a remarkable flexibility, permitting a wider class of two-photon states, including ultra-broadband, highly-anticorrelated states.

Such a state is typically referred to as highly entangled, but one should keep in mind that the large vacuum component of the state renders this "entanglement" useful only in a post-selection experiment.

Sov. Phys. JETP

Other

Such a state is typically referred to as highly entangled, but one should keep in mind that the large vacuum component of the state renders this "entanglement" useful only in a post-selection experiment.

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